Photograph-printing machine.



H. C. BUNTING & M. P. ANDERSON.

PHOTOGRAPH PRINTING MACHINE.

APPLICATION FILED MAR. ZI. I916.

Patented Aug. 29, 1916.

m P n. 0% 2 #M A TTOR/VEY UNITED STATES PATENTmFFIoE;

HERBERT C. BUNTING AND MAURICE P. ANDERSON, OF SEATTLE, WASHINGTON.

PHOTOGRAPH-PRINTING MACHINE.

Specification of'I-etters Patent.

Application filed March 21 1916. Serial No. 85,738.

photograph printing-machines, and the object of our invention is to provide a photo printing-machine which shall be adapted for use in the operation of printing on sensitized sheet material photographic pictures from negatives of such pictures, and which shall embody operative clamping means for clamping a negative with an even pressure between the sensitized sheet, upon which the picture is to be printed, and the flat surface of one side of a transparent plate whose other side may be exposed to rays of light of an associated lamp, without wrinkling either said negative or said sensitized material.

We accomplish this object by devices illustrated in the accompanying drawing wherein- Figure 1 is a plan view of a structure embodying my invention; Fig. 2 is a View of the same in side elevation; and Fig. 3 is a fragmentary view of the same in vertical section on broken line 00, w, of Fig.- 1.

Referring to the drawings, throughout which like reference numerals indicate like parts, a rectangular table 4 is supported in a horizontal plane'by a supporting frame comprising legs 5, 6, 7 and 8 and crossbraces 9, 10, 11, 12, 13 and 14;; and said table 4 is provided with a rectangular'hole extending downwardly therethrough, the top edges of which hole is rabbeted-to receive and support a glass plate 15 disposed therein so that its top surface shall register with the top surface of the table 4, as more clearly shown in Fig. 3.

As more clearly shown in Fig. 3, to the underside of the table 4 is secured a lamp box 16 disposed directly beneath the glass plate edge portions of its four side Walls adjacent to the edges of said rectangular hole, and disposed on the central portion of the floor of said lamp box 16 is an electric lamp 17 that may serve to direct rays of light through said glass plate 15 whereby when a 15 with the outwardly flanged top.

negative is placed on the top surface of said glass plate 15 with sensitized sheet material placed smoothly on top of said negative the picture of said negative will be printed on said -sensitized sheet material in a manner well known to those skilled in the art.

On the top of the table 4 adjacent to the rear edge of the glass plate 15 are secured two brackets 18 and 19 each of which is provided with an oblong slotted hole (as hole 20 shown in Fig. 3) extending therethrough with its longer parallel sides vertically disposed, and disposed to extend between said brackets 18 and 19 and through said holes Patented Aug. 29, 1916.

20 is a pivot rod 21 that is adapted to be I moved in vertical directions while in engagement with the vertical sides of said holes 20. Independently hinged to said pivot rod 21 are two presser-boards 22 and 23 of which the Presser-board 22 is twice the length of the presser-board 23, the shape and dimensions of the combined areas of said two press'er-boards being such as will wholly cover the hole through the table 4 within which is disposed the glass plate 15.

Secured to the under side of the presserboard 22, on that half of it that is farther from the pivot rod 21, is a board 24 of a thickness equal to the presser-board 23, whereby said half of the presser-board 22 is of double thickness, and whereby when the presser-board 22 is disposed to engage the other half of its under side surface with the top surface of the presser-board 23, then the bottom side of the Presser-board 23 will be flush with the bottom side of the board 24: that is securedto the presser-board 22.

Adhesively secured to the under side of the presser-board 23 is a platen 25 of yielding material, as felt, and also in a like manner secured to the under side of the board 24 of the presser-board 22 is a similar platen 26, which platens 25 and 26 may both evenly engage with the top surface of the glass plate 15 wholly to cover the rectangular hole through the table 4 when both of the presser-boards 22 and 23 are swingingly moved is a bar 28 disposed to extend transversely in a line half way between the rear ends and to the top edges of the ribs 27 Bil the central portions thereof, and connected to the under side of said bar 28 are the ends of two helical compression springs 29 disposed, each on a different side of the central one of said ribs 27, to extend freely through a hole formed in the presser-board 22 to the top surface of the presser-board 23 to which its other end is connected, as

shown more clearly in Fig. 3, whereby the; presser-boards 22 and 23 will be maintained in different angular positions with respect to the pivot rod 21 when they are not both in a horizontal plane to engage the platens 25 and 26 with the glass plate 15, and whereby, as the presser-board 22 is forcibly moved to swing downwardly to such horizontal plane, the platen 25 shall be the first to engage with the glass plate 15.

in the central portion of the top edges of the ribs 27 are formed bearings for a transversely disposed shaft 30 which is confined in its position by straps 31, and to each of opposite ends of said shaft 30 is articulated one end of a connecting rod 32 which connecting rods 32 extend downwardly through slotted holes in the table 4 to a lever 33 with which their other ends are articulated.

The lever 33 is hinged at one end to the cross-brace 13 on the rear side of the supporting frame to extend forward to project its other end beyond the front side of the supporting frame where it may be actuated by ones foot forcibly to communicate a downwardly swinging movement to the presser-board 22. Secured to the inner side of the leg the upper end of a long helical ter. 1 spring 34 whose lower end is attached to the lever 33, as more clearly indicated by dotted lines in Fig. 2, which spring 34: is adapted to raise thelever 33 with sufficient force to swing the resser-board 22 upwardly from a horizontal position when ones foot is disengaged from the lever 33. In the operation of the structure illustrated and described, the light of the lamp 1'? being extinguished a negative is placed on the top surface of the glass plate 15 and on top of such negative is disposed sensitized sheet material, as sensitized paper, upon which aphotograph is to be printed and thereupon the lever 33 is depressed by ones foot to forcibly pull down the presserboard 22 with a swinging movement which will cause the platen 25 of the presserboard 23 first to engage with'the top side of the sensitized sheet material, after which the platen 26 will engage with said sensitized sheet material, thus forcibly to press evenly the entire area of the negative and the sensitized sheet material against the glass plate 15 without wrinkling it, which result is effected irrespective of the thickness of the negative and the sensitized sheet material for the reason that the oblong holes 20 permit the pivot-rod 21 to move vertically to a position determined by the combined thickness of the negative and the sensitized sheet material.

When the negative and the sensitized sheet material are thus disposed between the platens 25 and 26 and the glass plate 15 the lamp 17 may be lighted to project its rays through the glass plate 15 to eflieet the printing in a well known manner.

Obviously, the lever 33 may be provided with detent means not shown, whereby it may be maintained in its depressed position during the time required for the light to effect the printing of the picture on the sensitized sheet material; and well known means, not shown, may be employed to I cause the lamp 17 to be lighted when the lever 33 is depressed and to cause it to be extinguished when the lever 33 is released to permit it to rise in response to tension of the spring 34-.

Manifestly, our invention is adapted for printing blue prints of mechanical drawings as well as for printing photographs from negatives.

Changes may be made in the forms, dimensions and arrangement of parts of our. invention without departing from the spirit thereof.

What we claim is:

1. In a photograph printing machine of the class described, the combination with a table having a glass covered hole extending downwardly therethrough, of brackets fastened to the top surface of said table,

said brackets being provided with. oblong holes extending horizontally therethrough with their longer sides in vertical planes;

a pivot-rod disposed within the holes of said brackets to extend horizontally therebetween and to be movable vertically therein; two presser-boards each independently articulated to said pivot-rod and both adapted to be swung thereon to and from positions wherein their lower side surfaces engage with the top surface of the glass of said glass covered hole conjointly and "wholly to obscure said glass covered hole; yielding means associated with said two resser-boards whereby they are normally maintained relatively indifferent angular positions whenever said presser-boards are not both engaged with the top surface of the glass of said glass covered hole; and means for moving said presser-boards to and from the top surface of the glass of said glass covered hole.

2. A photograph printing machine of the class described, which embodies a table having a glass covered hole extending downwardly therethrough; a presser board articulated to said table and adapted to be removably disposed to obscure a ortion of said glass covered hole; a secon presserresser-board and with said table whereby 10 said first named resser-board may be actuated forcibly to en go with the glass of he]? said glass covered In witness whereof, we hereunto subscribe our homes this 14th day of March A. D.

HERBERT C. BUNTING. I MAURICE P. ANDERSON.

Witnesses:

FRANK WARREN, O. JoHNsoN. 

